Most ARM fans keep repeating the same fucking mantra - It uses less power then x86. Bullshit. It's not just the CPU that results in power demand for mobile systems (Tablets, phones and what not) it's the GPU, Screen, disk and all the other parts that go into the thing and Intel has finally paid enough attention to overall power budget that they're actually beating most of the ARM based SoC's out there in both power savings and performance.
Look at the power demand of the Nvidia Tegra SoC's. Tegra3 was decent but limited GPU performance. Tegra 4 though blows through a batter like Richard Pryor did with hookers and Coke.
Even Qualcomm's Snapdragon SoC doesn't do any better as the GPU blows the power budget. Intel's Atom CPU's are competitive with ARM in performance and power budget. What screwed them was the fucking north bridge and GPU. That actually used more power then the CPU did yet they've fixed that with the latest Atom's due to a new SoC design focused on Power savings and yes I've used an early Atom Netbook - painful even with XP on it. The new ones are pretty decent now.